KR900003404B1 - Multiple cylinder rotary compressor - Google Patents

Abstract

The compressor comprises a rotatable driving shaft having eccentric portions. Superposed cylinder blocks have cylinders there in concentric to the driving shaft. Rotors are attached to and driven by the eccentric portions of the driving shaft to rotate along the inner circumferential surface of the cylinders, adjacent ones of the eccentric portions of the driving shaft being rotatively offset by 180 degrees relative to each other. Vanes are slidably received in respective cylinder blocks and pressed against an outer surface of the rotors by a coil spring to divide each of the cylinders into a suction side and a compression side. The suction side of each of the cylinders have a suction passage with the suction passage of one cylinder superposed to the suction passage of the other cylinder.

Description

Multi-cylinder rotary compressors

1 to 12 show the present invention, Figure 1 is a refrigeration cycle.

2 is a longitudinal sectional view of a two-cylinder rotary compressor.

3 is a sectional view taken along III-III of FIG. 2;

4 is an enlarged cross-sectional view of a main portion of the valve device.

5 to 12 are schematic diagrams of the rolling piston compressors, which describe the compressed state of the rollers along the inner circumferential surface of the cylinder chamber.

13 is an enlarged sectional view of a main portion of a valve device showing another embodiment.

14 is a refrigeration cycle diagram showing a conventional example.

* Explanation of symbols for main parts of the drawings

30: rotary compressor 36: rotary shaft

39: middle partition plate 40, 41: cylinder room

42, 43: cylinder 44, 45: eccentric portion

46, 47: roller 50, 51: low pressure chamber

52, 53: high pressure chamber 54, 55: vane (VANE)

56, 57: coil spring 63: through hole

64: valve device

The present invention relates to an improvement of a multi-cylinder rotary compressor having a valve device for controlling a refrigerating capacity.

The conventional refrigeration apparatus is comprised as shown, for example in the laboratory 55-15009. A conventional example is described here with reference to this publication.

In Fig. 14, (1) is a rotary compressor, (2) is a condenser, (3) is a pressure reducing device, and (4) is an evaporator, and these constitute a sequential piping connected refrigeration cycle. The rotary compressor 1 is comprised by the rotary compression element 5 and the motor (not shown) which drives this compression element.

The rotary compression element 5 includes a roller 9 for rotating the inside of the cylinder 6 by the eccentric portion 8 of the cylinder 6 and the rotating shaft 7 and a low pressure chamber in the cylinder 6 in contact with the roller. 10) and a vane (VANE) 12 which separates the high pressure chamber 11, and a suction hole 13 and a discharge hole 14 which are installed in both cylinders 6 of the vane.

A suction pipe 15 connected to the outlet side of the evaporator 4 is connected to the suction hole 13.

16 is a discharge chamber communicating with the high-pressure chamber 11 having the discharge hole 14, which is formed in the cylinder 6 and has a discharge valve 17 for opening and closing the discharge hole 14 therein. It is installed.

In the discharge chamber 16, a discharge tube 18 connected to the condenser 2 communicates with each other. The control part 19 is provided in the wall of the cylinder 6 which opposes the discharge hole 14, and this opens and closes the guide hole 20 which communicates in this cylinder and drills a hole in the cylinder 6 wall. It consists of the control room 22 in which the capacity control valve 21 was provided. Reference numeral 23 denotes a control tube communicating with the control chamber 22, which is switched between the outlet tube of the condenser 2 with the third valve 24 and the suction tube 15 at the outlet side of the evaporator 4, respectively. It is supposed to communicate.

In the rotary compressor of this structure, by switching the third valve 24, the high pressure refrigerant at the outlet side of the condenser 2 causes the low pressure refrigerant at the outlet side of the evaporator 4 to act on the capacity control valve 21. The refrigeration capacity of the rotary compressor 1 is controlled by closing or opening.

However, the conventional rotary compressor operates the low pressure refrigerant in the control chamber 22 by switching the third valve 24 so that the capacity control valve 21 is opened so that the inlet hole 13 flows into the cylinder 6. In order to return a part of the refrigerant from the control tube 23 to the suction tube 15, pulsating refrigerant flowed through the control tube, resulting in a large vibration or noise, or a thick pipe required to return the refrigerant. .

In order to solve the above problems, a multi-cylinder rotation is made by appropriately communicating a passage communicating a plurality of cylindrical chambers arranged with an intermediate partition plate in an axial direction of a rotating shaft with each other, a valve device for opening and closing the passage, and each cylindrical chamber. The purpose is to control the refrigeration capacity of the compressor.

The valve device is provided by communicating a plurality of cylindrical chambers in which an intermediate partition plate is inserted in the axial direction of the rotating shaft with a passage and providing a valve device for opening and closing the passage in the passage.

The present invention communicates a plurality of cylindrical chambers through passages, and at the same time, by installing a valve apparatus for opening and closing the passages in the passages, part of the gas introduced into each cylinder chamber is discharged from one passage through the passages. It avoids to the other cylindrical chamber to control the refrigeration capacity of a multicylinder rotary compressor easily.

EXAMPLE

Next, the present invention will be described according to the embodiments shown in FIGS. Numeral 30 denotes a rotary compressor, numeral 31 denotes a condenser, numeral 32 denotes a pressure reducing device, numeral 33 denotes an evaporator and pipes these in order to form a refrigeration cycle.

The rotary compressor (30) houses two rotary compression elements (37) (38), each of which drives the motor element (35) at the top in the hermetic container (34) and the rotary shaft (36) of the motor element at the bottom. have. Reference numeral 39 denotes an intermediate partition plate on which the rotary compression elements 37 and 38 are planned. The rotary compression elements 37 and 38 are cylinders 42 and 43 having a rotary shaft 36 and a central cylindrical chamber 40 and 41 and an eccentric portion mounted to the rotary shaft 36 through a 180 ° rotational angle. (44) (45) and guide grooves (48) provided by drilling holes in the rollers (46) and (47) and the cylinders (42) and (43) rotating along the inner circumferential surfaces of the cylindrical chambers (40) and (41). (49) and the rollers (46) and (47) which slide and slide in the guide groove to separate the cylinder chamber (40) (41) from the low pressure chamber (50) (51) and the high pressure chamber (52) (53). As the upper bearing part 58 and the lower bearing part 59 which close the opening of the vane 54 and 56, the coil spring 56 and 57 provided in the back side of this vane, and the cylinders 42 and 43, Consists of. 60 is a suction hole which divides and opens to the low pressure chamber 50, 51 of the cylindrical chamber 40, 41 in two stages. 61 and 62 are discharge holes opening in the high pressure chambers 52 and 53 of the cylindrical chambers 40 and 41. Numeral 63 is a through hole installed in the middle partition plate 39, which is a cylindrical chamber 40 of the upper shaft cylinder 42 and a cylinder 43 of the lower shaft separated from the suction hole 60 in a rotational direction to some extent. ) And the cylindrical chamber 41 of (). 64 is a valve device for opening and closing the through hole 63. The valve device slides inside the hole 65 orthogonal to the through hole 63, and the spring 67 presses the plunger. And a control chamber in which refrigerant pressure is applied to the plunger 66 on the opposite side of the spring 67 and the communication hole 69 communicating with the spring chamber and the cylindrical chamber 40 on the upper side. It consists of 70.

The control tube 71 formed of the capillary tube, such as a capillary tube, is connected to this control room. 72 is a third valve connected to the control tube 71, one side of which is the discharge tube 73 mounted on the upper wall of the sealed container 34, the other being a rotary compression element 37 (38). Are connected to suction pipes 74 attached to suction holes 60 of the " In the multi-cylinder circuit accumulator configured as described above, the refrigerant introduced into the cylindrical chambers 40 and 41 from the suction hole 60 is discharged in a compressed manner with the rollers 46 and 47 and the vanes 54 and 55. In 61 and 62, it is discharged into the sealed container 34. Therefore, the refrigerant through the motor element 35 flows into the condenser 31 of the discharge tube 73, where it condensates.

The refrigerant of the condensed liquid is depressurized in the depressurizer 32, and evaporated in the evaporator 33 and returned to the rotary compressor 30 in the suction pipe 74.

In this operation state, when the third valve 72 communicates with the discharge tube 73 side, it is conducted from the control tube 71 to the control chamber 70 so that the high pressure refrigerant acts on the plunger 66 and the middle partition plate is opened by the plunger. The through hole 63 of 39 is closed. By closing the through-holes, the refrigerant flowing into the cylindrical chambers 40 and 41 from the suction hole 60 is also almost compressed and discharged from the discharge holes 61 and 62 for full load operation. If the third valve 72 communicates with the suction pipe 74 side, the control valve 71 is transferred from the control pipe 71 to the control chamber 70, and the plunger 66 is pressed by the spring 67 to control the chamber (90). The through hole 63 is opened by pressing on the 70 side.

The refrigerant introduced into the cylindrical chambers 40 and 41 from the suction hole 60 by the opening of the through hole is passed through the through hole 63 until the through hole 63 is closed in the rollers 46 and 47. Through this, one cylinder chamber is alternately avoided from the other cylinder chamber to reduce the amount of refrigerant discharged from the discharge holes 61 and 62 so that the refrigerating capacity is at least controlled.

In other words, the rollers 46 and 47 compressing the refrigerant in the cylinder chambers 40 and 41 are rotated beyond the 180 ° rotation angle, and the upper rollers are positioned based on the position where the vanes 54 and 55 slide and move. When 46 is inserted into the compression process at the rotational angle of 0 °, the lower roller 47 performs the compression process and the suction process simultaneously at the rotational angle of 180 °. In order to do so, the through hole 63 is opened in the high pressure chamber 52 of the upper cylinder 42 and the low pressure chamber 51 of the lower cylinder 43, and the refrigerant in the high pressure chamber 52 is stored in the low pressure chamber 51. ), The amount of refrigerant pressurized in the upper cylindrical chamber 40 is reduced and inserted into operation of low capacity.

When the same upper roller 46 has a rotation angle of 180 ° and the lower roller 47 has a rotation angle of 0 °, the coolant of the lower cylinder 43 and the high pressure chamber 53 passes through the upper hole 63 through the through hole 63. Avoid the low pressure chamber 50 of 42, the lower rotary compression element 38 is to operate at a lower capacity.

The through hole 63 opened and closed by the valve device 64 avoids the upper cylindrical chamber 40, the lower cylindrical chamber 41, and the refrigerant from the other cylindrical chambers 40 and 41, mutually. Refrigerant does not flow in the air. As a result, when the rotary compressor 30 has a low capacity, the control tube 71 is avoided so as not to vibrate by the pulsation of the refrigerant. The communication hole 69 communicating with the spring chamber 68 and the upper cylindrical chamber 40 has a plunger 66 when the third valve 72 is switched from the discharge tube 73 side to the suction tube 74. , The refrigerant pressure compressed in the cylindrical chamber 40 is applied to the spring chamber 68 to move the plunger 66 to the control chamber 70 side so that the through-hole ( 63 is forcibly opened.

In the above description, the valve device 64 is operated to operate at a refrigerant pressure. However, the valve device shown in FIG. 13 may be used as the solenoid valve 75. In this case, the pipe connection between the valve device and the refrigeration cycle is not possible. Needless to say, eliminating the piping work of the control device.

The multi-cylinder circuit voltage accumulator of the present invention communicates the cylindrical chambers in which the intermediate partition plate is inserted in the axial direction of the rotating shaft in a passage, and at the same time, a valve device for opening and closing the passage is provided. As long as it opens, it controls the freezing capacity of the rotary compression element.

Furthermore, since the refrigerant in the cylindrical chamber arranged in the axial direction in the passage is avoided from each other, the vibration and noise of the pipe due to the pulsation are prevented without having to take out the refrigerant from the outside of the compressor.

Claims (4)

An intermediate partition plate is inserted in the axial direction of the rotating shaft and driven by a cylinder having a plurality of cylindrical chambers and an eccentric portion of the rotating shaft to press the roller rotating along the inner circumferential surface of the cylindrical chamber and a spring on the outer circumference of the roller to press each cylinder chamber into a high pressure chamber. And a passage for communicating the cylinder chamber with each other and a valve device for opening and closing the passage in the multi-cylinder voltage accumulator having vanes divided into low-pressure chambers. The multi-circuit voltage accumulator according to claim 1, wherein a passage is provided in an intermediate partition plate. The multi-circuit voltage accumulator according to claim 1, wherein the valve device is operated at back pressure. The multi-pass circuit voltage accumulator according to claim 1, wherein the valve device is a solenoid valve.

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